Automatic lock slider for separable fasteners



March 1950 l. MARINSKY AUTOMATIC LOCK SLIDER. FOR SEPARABLE FASTENERS Filed Sept. 4, 1945 R O T N E v m ATTORNEY Patented Mar. 21, 1950 UNITED STATES TENT OFFICE AUTOMATIC LOCK SLIDER FOR SEPARABLE FASTENERS 2 Claims.

The present invention relates. toseparable fasteners, and has particular relation to a novel construction for an automatic lock slider.

The principal object of the invention. is to provide a lock slider mechanism for a separable fastener of the closed type which automatically locks against separatingmovements of the fastener.

Another object of the invention is to provide a simple construction for anautomatic lock slider, which requires no separable or movable parts.

A further object of the invention is to provide a lock slider construction which guides the interlocking members of a separable fastener in a path that automatically locks the interlocking members against separating movement when the slider is moved to any position along the stringer tapes.

With the above and other objects and advantageous features in view, the invention consists of a novel arrangement of parts more fully disclosed in the detailed description following, in conjunction with the accompanying drawing and more specifically defined in the claims appended thereto.

In the drawings:

Fig. 1 is a view of part of a separable fastener, the stringer tapes being shown in partially separated position;

Fig. 2 is a rear view of Fig.1;

Fig. 3 is an enlarged section on the line 33 of Fig. 2;

Fig. i is an enlarged end'view of the novel slider mechanism;

Fig. 5 is an enlarged view of Fig. 1, the slider being shown in section with the upper portion thereof removed;

Fig. 6 is a perspective view of the slider of Fig. 1; and

Fig. 7 is a perspective view of a slider having a construction suitable for use with standard types of separable fastener.

It has been found desirable to provide a lock slider construction which has no movable or separable parts, and which may be used with a separable fastener of the type having closure tape sections which normally cover the interlocking members, the slider parts being so arranged that accidental or inadvertent opening of the stringer tapes is automatically prevented, at any point to which the slider has been moved.

I have found that the passageways for the interlocking members formed within the slider body may be so designed that the interlocking members cannot separate unless the slider is manually moved'for that purpose, and I have therefore devised a slider construction which normally retains theinterlockingmembers in interlocked position, thenallows them to slightly separate, the slight separation being insufficient to permit complete separating movement of the interlocking members, and finally allows the interlocking members to fully separate into diverging separating passageways.

Referring to the drawings, the separable fastener It includes two stringeritapes ll, l2,.which respectively have groups of spaced interlocking members l3, Hi, anda slider l5 for engagingxor disengaging the interlocking. members when the slider is moved by means of its pull tab It.

The stringer tapes are preferably constructed as shown in Figs. Land 2 and in section in Fig. 3, the stringer tape l2 comprising 'a rear tape section H, a bead edge l8 preferably formed by folding the tape section around a suitable'core and sewing or stitching as indicated at l9, and a forwardly extendingclosure tape section 20. The stringer tape II is similarly made with a rear tape portion 2|, an edge bead 22, formed by folding, the tape and stitching as indicated at 23, and a forwardly extending closure tape section 24. The interlocking members l3 and 14 are respectively mounted on the beads 22 and IS.

The slider 15 is of special design, as disclosed in Figs. 4, 5 and 6, and includes an upper plate 25 and a lower plate'2'6 joined together by a wedge-shaped central connection 21, the lower plate having side elements-28 and 29 of special design. The upperplate 25 has an extension 30 which turns the upper plate 25 in spaced relation thereto to form a top 3| for the slider, the top 3| having upstanding flanges or ridges 32, 33 which are bent over to receive the in-turned ends 34, 35 of the pull tab l6.

Referring now to Figs. 5 and 6, the sides 28 and 29 are in spaced parallel relation as shown in Fig. 5, and then are cut away or recessed as indicated at 36, 31 to provid upwardly extending portions as indicated at 38, 39, which are wider than the sides 28 and 29, which are at the rear portion of the slider, the portions 38 and 39 nevertheless being parallel so that the interlocking members I3 and [4 cannot completely separate and disengage, whereby any pulling movement on the stringer tapes tending to open the separable fastener, simply turns the particular interlocking members l3 and I' l positioned in the recesses 36, 31 so that they press against the inner walls of the sides 38 and 39 and cannot rotate so as to disengage. Th sides 38 and 39 are extended upwardly to provide tips 40, 4|, which tips are turned outwardly so as to form diverging passageways 42, 43 in conjunction with the wedge-shaped connection 21, for completely separating and disengaging the interlocking members.

With the slider construction shown, the slider may be moved to any position along the length of the separable fastener and left at the desired point. If any pull or tendency to open the stringer tapes is exerted, the tapes bend, and the contiguous interlocking members are caught within the recesses so that they cannot separate, wherefor the slider becomes a self-locking slider. However, when the pull tab is pulled in either direction, then the stringer tapes are so guided as to permit engaging and disengaging movement of the interlocking members.

When the slider is mounted on the stringer tapes of the closed type, such as shown in Figs. 1 and 2, the lower plate 26 is positioned between the interlocking members and the lower closure tape 29, and the upper plate 25 is positioned over the interlocking members and below the upper closure tape 24, the top 3| extending over th upper closure tape section 26 and having its free end turned slightly downwardly, as indicated at 44 in Fig. 6, to snugly seat the top closure section between the end 44 and the extension 30. The arrangement is thus very compact; the slider can be made of stamped metal or the like, and the parts are readily assembled, without requiring springs, movable cams or similar parts.

The above described construction of slider is particularly suitable for separable fasteners of the covered type, but may be readily adapted for use with separable fasteners using standard open type interlocking members. A construction suitable for this purpose is shown in Fig. 7, the slider 45 having an upper plate 46 provided with means such as upstanding recessed ribs 41 for receiving the in-turned ends 48 of a pull tab 49, the slider having a lower plate 50 which is connected to the upper plate by a wedge-shaped connection 5!, as illustrated, the lower plate 50 having sides 52 which have their rear portions 53 formed as spaced parallel guide sides for the interlocking members, and their forward portions comprising recessed portions 54 which have their inner surfaces parallel and spaced slightly wider apart than the spacing between the rear portions 53, the sides 52 having terminal tips 55 which are bent outwardly to form diverging passageways 56 in cooperation with the wedge-shaped connection 5|.

Although I have described specific constructional embodiments of my invention, it is obvious that changes in the size, shape, relative proportion and relative spacing of the parts may be made to meet the requirements of difierent separable fastener designs, without departing from the spirit and the scope of the invention as defined in the appended claims.

I claim:

1. A slider for a separable fastener having interlocking members, comprising an upper plate, a lower plate, a wedge-shaped connection at the forward end between said plates, said lower plate having upstanding edge sections at the sides thereof extending towards the upper plate, the edge sections having parallel rear end portions, recessed parallel intermediate portions, and diverging forward end portions, whereby a passageway for the interlocking members is provided having parallel sides for the joined interlocking members, then slightly Wider parallel sides for partially separated interlocking members, then spreading sides which cooperate with the wedge-shaped connection to wholly separate the interlocking members.

2. A slider for a separable fastener having interlocking members, comprising an upper plate, a lower plate, a wedge-shaped connection at the forward end between said plates, and means comprising edge sections at the sides of one plate extending towards the other plate, said edge sections having parallel rear end portions for initially guiding the interlocked members in a linear path, intermediate portions confining the interlocked members in a slightly wider linear path of a width to permit slight spreading of the interlocked members but not of a width to permit separation thereof, and diverging forward portions which cooperate with the wedge-shaped connection to wholly separate the interlocking members.

ISAAC MARDTSKY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,853,634 Norton Apr. 12, 1932 FOREIGN PATENTS Number Country Date 200,355 Switzerland Mar. 16, 1939 

